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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb9b8027c8abe3762e3657d10638c158442958fbd5e3415033635f939e15746' 
  AND token = 'Sg2VrjKTPZXDXoWGMm4mdvfZM7akJLy383DPb/lGdt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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