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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac714c959afec6077fc3c5c4f0d34d04a1c23ae308635966200884c724abe9a' 
  AND token = 'OI/RpfoHNkRx/Qr7xp/CEYvCsNEaNsa6z3jRV5e5Djo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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