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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05676c99aa8ab5c6b3bbf1a9d4ad265fdda830e5f532a05aaf8b4387497e203b' 
  AND token = 'N1+F46ZX+rEpfoFfem3uFNip8Y00aCZfoh+0dp07SEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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