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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8606fabe4b2486d03ec421b0c87d5a64ca54db72274099016d5ea49989b3d47a' 
  AND token = 'pmgUnK+B10lVycc3Oznd4oZoL3KSNawPmOMQz1SJngw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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