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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00339dd84429e183739cb1a7dd637372a42762dafcf689d3cd968a634c4ced59' 
  AND token = 't3rBDvCRm8tU0fULMaNjcAOSKlCibtUkgcNSVBJY7DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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