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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b756f1d7fef817d46978ce3e0f145f44be8eaea18fc5f3d1747fb6115c277e' 
  AND token = 'Rj9H3KAT2IgbJCNdQMsa/JjAHDcN0yZ/AF+AKVrg3Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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