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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80864da23367e16d22aadc8d415024ba34bb83aad5ada088581e1dba22c40da3' 
  AND token = '4lQunqZSzlsux1pCZi4t9zyJ3N4pxRtmp/L6RIz76Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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