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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba106f555fd12a5c7706328dc4fef33f14698d8ef14a9ab32f258869c21cc269' 
  AND token = '8u2zTQEJAWXMRf7XPpQlVsE9VI97/CYz26d4+cNPvQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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