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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06893dee3d64fe3b74d83ffadb20c63a2aec4650c9c6ed38f52d1e875ca6d6af' 
  AND token = 'OOtrhxLgxjy0Rjqg/u6wGfRveYAFx4F4SjYEzPFKIFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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