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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60e8be9a9e2d87b459f0ff4e36a84289b00c42f8bd8a9fde335f8ecd343b560' 
  AND token = '0sMn7S6JswZBzaeZAXt5LCS9XCB4pvWCiLB72K61LB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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