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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fab22bfa8e77a97c9b1dda39ad13894476aa22f16e00a7b68842b86f66e8c82' 
  AND token = 'Y+kRl8G68BRrLEW8ij7l0II6dvLSvIG15aK7bEyIoEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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