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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ee006231a708378301336c6fa3e6c0f5804796c662b894d70627a14a30be9d' 
  AND token = '1uNs9M9qpNE2lthCTjLQIbXSOt6GWsaIIZjifPVQnTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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