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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca212be7cd63ec9fe445ef60c8a0966f06af15f28bebc2efc2b5c0c07c1b167' 
  AND token = '/Ror3/dAmAs9Bub0c+DiYXa9IpST4RXD2EdpDYRi9ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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