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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2956d362039dab9ce4a53dc14fc2b72bfea84724753f8be756c3d1c6be8fb91c' 
  AND token = 'zqchHt3+Oxy+OjR10p8F1uRkWltMKU3ud9rRcHn+0Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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