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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970e1854479a6f0101b377e779f762ea2e3b34163a4890bdc94b665fa3a4f041' 
  AND token = 'pAliytdcBR2YcP3gSCqjRaOKhjvOR/s00sSMXpjP7r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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