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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28698508137f2cebbf416973e16ad11263be0fdf5ceeaf2869443388fbb7c7b' 
  AND token = 'PFHUBvLfvOZyVb7SRy6i3g9LCF8LgpRtkETiWdhh26A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}