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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e30a5770370d60c3508c0bed5533fc32c537644516fd3ed34849e3f3f8878d0' 
  AND token = '3XJrs2dHE0xALSyYBArmcPrSi/8hPFU4N/RZ6mH+pqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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