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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f19410d231dc461987b4cce0dc7a26693af6b22be32a05bae76d2a72d46835' 
  AND token = 'CCdPNgUFDHC/lWWhJ/kHWTs7oHUkdbkulYLUjt0Dozw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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