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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abc205444d6070248b23b953e55b94b39d0a583debba7ba55fbfcee29f6c936' 
  AND token = '4IZMTJuGdI7Df0b+1pldQn5iPKr8HnGrYbCT0v8veaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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