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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72e74bbec7597bf3f5112c3ceb72da4140d3613fc788f52bf1f747b3ee55939' 
  AND token = 'MutaByVtoAwWcJGuYDVg21EQ0WxqJBbHDH6Z39H030I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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