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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4296143890226d4866d13d448eff57c778b5d085347793ee6e99b9499cb79be' 
  AND token = '84/p5ZphCZVMqkQofyRbZv0m03Yc3PE+8/KuPsaI+ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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