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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13eacc0fe42def87c7314223733ed02f594a5334bba698707161833a19d33bb' 
  AND token = 'CpaaiBnK6bPkapF+jGfofcnpi7pI+Cvu9Go3hjVuy7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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