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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bbf162033a9ce2932c6e66bb33b00763763e756ede39892d0f92b90ca3192e' 
  AND token = 'd5hSLviQW/naB4rKBWBNM5HJYzQY+K2s5FUFf6LjLNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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