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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db94c2cde5aa320e7eb4b62651cbc81b5cdb84c9787fa28b75c07f62a78b7ea' 
  AND token = 'EGv76UB+WQBy7S2dL3CybUJHg4oNLYDax6oEGTt423I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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