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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076e44106aa209d6763c0da34b21500dc970db6090dcde3a71d786e78659d03e' 
  AND token = '82fnsNPWHciRKNeY961rAniiWYQK5mFZAAQlhHx93lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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