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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e13264ea6ecc1837665b19d4051d7e8c2a2193829a6bdfab6f98742c18e45b' 
  AND token = '1LQ2ABGURv6ogZM24ZgluROFLlzJpDW3D9IOB8oNtSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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