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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf7078a3d46a64489309f01fcc998fb9337109e2844efec279c98da3066d04c' 
  AND token = 'Mcf+SAHMDnkKG8Ca2AqEx82am7mx8dzb6fEb1gU3CGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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