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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba14f88b4e6a7f51bec984524b1ff4114826eca6323c8c4626caea93c14ebc92' 
  AND token = 'eU8s69XGvcHYcdbLapXNojRKE+GWqd14vdljxQEsnFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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