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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5e62494a8660de2fc650b2543c24702d228376f7d194ba97d3a0a333493562' 
  AND token = 'ShiL9Tam1juXmJA8GGhxu26DNyppziSru9kch7jDHLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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