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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9679d8f0e39596e54d32f02d8da17ea6705e780497cffad03c8eaf67180dcf02' 
  AND token = 'hs1FAlGXJK5izGc5KHgo09pPsB+SxXiuiWVUk0YeBCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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