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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6faaa55cad8c9203a2037edef81e8d26d0b26803c4cccbe9d414fc24d73a62' 
  AND token = 'rKGB8062Rk5E7hmwja+QQ6hursj4d/rixVaRdzgl4kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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