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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9301070b3433aa2b2724f8619107082cf743442a5a0b0d6d9be478397de838' 
  AND token = 'Lpy4dcnJuz6An0S8m2FhIEZqsCGp1RgQcr/Dp9p+3Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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