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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023903c35482bc565dbbb087d33a12447bd901ae7ae3abc0d0029f000674ee5a' 
  AND token = 'T0o+qr2437ROHHNQz3Zy1ipxkIuNDhXnpsKzsouA4GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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