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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74499239e1bd32e5359d6613b65204d09e788a5fbd7d9b4b883563538eedde2e' 
  AND token = 'Flsz5Iq5pX6SldpNkv7O5XubFt1SueOmvWhNu9d6T34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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