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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b408925bc36467b08e6d03df5a98e46da14f2fe0c1c9e0b13cbdc2c25f84503c' 
  AND token = 'stdtObIUIvtKHi9ssN8/BaZGPevjHwew7OqmZ1bYu80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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