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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff800ae63372797d52bfdf2c5b77faf43bbfa79afe0bb8f295476890b460667' 
  AND token = 'cks04Tu1+pwQDTrNqydIvoomGX45id5SXtRIs7r46C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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