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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0c00b22f35a712fb417820f33086758626762e05c0d0910805af2e6e2a98bc' 
  AND token = 'x+lHZoUY+Ih974EG6MsHwj4cF/whD3YcRCvD68w+r8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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