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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1b403fd8f0eb9401a03f0480642f16ecb0cd2551fe1e1d514dfbc71bf048eb' 
  AND token = 'lJ1U9+sfKky7lotYZwbMMLv+6V8AbE7CczhllqDWtm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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