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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4d1422e4d32f59d373598b6cbc423080a2d2fccacf4be7d43b6730d03c415d' 
  AND token = 'Z4RNwHYCviz+qJNAvXDLC+Rx439JuubeTTCUmFCSRVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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