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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0037ecd8c451c9f22c13a008f43ab9088a82d57126173e5195f972d72e99f9f5' 
  AND token = 's/hqH5s/r2ovMpZFsDd+sW7GiYx0S2JUxF9ZPQTp3w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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