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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac52ca8b7bb5e595c6fe14a03ef982f30fc12e03c8e280e7119ab8a1e8da220c' 
  AND token = 'T0qhruKvoXGW3vejDT9LmAOhROL4butoTh5mP26a6C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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