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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b708f6ee491c2d98303ac2f6a1f6170fa9b47a3ee5453c40cc867c801ef18a40' 
  AND token = '+pevQ602eyIpJC9sPEugHQ2dn5vDkabUqGpApQHjwAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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