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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddaa45e9ef3ca3c3ec2669a4495a7e84d2ef7ecf1cceb04cd055d60c9192fba' 
  AND token = 'bF/a5zhQ0LRsbf3MBM4faFowePOk/OxFrjOQKK4oAb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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