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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0795a2aa9a7e12b85f0c3ec7c9cc6504d87035f7f2d21f4a1d72681630367148' 
  AND token = 's1q7GnWY4SbI2XCXmFjQjriN3ka9xAIPgM0oMsm4jjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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