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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a190f22779e2f1bf2a163b4bac2c45da3b521bef7ccd47f0397c7c780bf80a' 
  AND token = '29wbsBcj9vMyzwyWeGBOoP7r05lu/y3/o5oqJayVXs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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